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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f317eee027d3c7dd8b151c212bbe10141047e2a4a2d5c13a8a73b09d5e470d3' 
  AND token = 'EixgEruOVNApVLNr7aw19/BXbP7/0+QY+x0w9shGIV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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