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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fef4e038a36c0a1d7bf3ec2ce9eb56b96cf21b581933e0b1d0e2b86c0e24383' 
  AND token = 'dqU15J24kZ3CrVJMO6YpGlQaJ51D67vNuXxYW3LsuXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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