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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '112307c37a3b36bd15dc87dceb167d6b4c20dc1aa8253ccc23e1de54c560cbe3' 
  AND token = 'rgbfvzaCmHMaRmhZ9K7RE7317+at6LHIX7avYtob4nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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