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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7b86c70946994afdb0ea7a9128d0c5ba6f8cab39ae130b376f5b20d6f91a282' 
  AND token = 'jeySjNIWLgM3jz8+/uGCCuwx5vW/EGz4i0mfnbIp+N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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