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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bbc050dc6d8fe73418a0a0d920075c04d747afc953b11b9976e3e682553a635' 
  AND token = 'Qa881vJ49yEjoSZ0Qx5Fv6JTJ1AFPtpfO4kzcib0B3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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