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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eb7bd19482eb64c361b0e25d75b2aaeb2c509f888878ca73738a6301723aee6' 
  AND token = '0m1Feff9GzWhNChQrvHzk06YkLCDofAVmLGcmY3DhmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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