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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da287fc32ee70375794d1a4b3d75e3fa5a41ac02fa8aa0bd31ac1e0a1f03663d' 
  AND token = 'QA1S4Y1IQnEO1AyHDu7HIg9pkaxtG6P8zjLym9tqsj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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