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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7b526156ad47835ef836e3e8edbe0244df4b7bbe6b2f3bfed7032ab4233927' 
  AND token = 'I/wfdNZSLsuR7u/+5b32eE9v3p6YyNYeqeQvrcPFqYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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