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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff7b29162fda0632759231e3efce528a7d25aa4bd7cd88100417a35249ea20cf' 
  AND token = 'Hog8yX4bNAHSGWcJk6S+ptf8DftItWnEWLTG1boQikI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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