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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c986b6575e89eec299fbcbd231634ced1e257e371769464df45a9bef088c1c1c' 
  AND token = 'Y2vbNV263DgEtnUK+gWRgrsUQbrwSj93z7pRF2pRxy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}