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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b8f1d5105f5f43f493ee17937cf9794e79dab3fea05ee803612e34dcdb8eb2e' 
  AND token = 'JMDaTd7B9hce9QFQGkw3cvm513HvR/GDnUmi0KXIMTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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