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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f6a5314518f3770f51518a11e5422a1d33f2384fbc0e432c06d387dbcf948d' 
  AND token = 'hFlNz/1A/FKVHEEI39sZVL33zsTcf3LblkGHMA0J3CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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