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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be2b57a912a9e9a2b6740eec659696485769c9eea07c4d3ce3828a90e8d58526' 
  AND token = '6D5gyIHDaYs+xILiy6zqUSaUWGMkk4GewCNvxnFJUQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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