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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb98ef6d5dea7b82e768236fd2e0b9ae6b710a83756f9b3691d042602e1fb5b' 
  AND token = 'oThEp0lJct5D6CuYDhIXmSB2u16AzCg6z5G4/GbTbU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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