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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9aaa6156f387060c09be4edfaf0fb51492441a5f9961a6f0d261e9ec49c482a' 
  AND token = 'cFwZqfYmIbH3owCQ65RQ0LGgdknzywVWuqmO+ibR7lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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