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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dc7b8f01312389f3a35bb73ef59477073d05af8b433b00311057692ef6bb01b' 
  AND token = 'c5TTesWnqLNTYqMA6CPTz0mQuFd2jDS7nA0XsJR0w1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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