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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec0d88841f0c417464d394774431a41d20a75f5af7b36150794a62e4d94f9ff' 
  AND token = 'JXos1iuInHiZz3obe3x9Z6c8dBKeXM84S9k1KmdpJVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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