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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8711b0ff99147b7bbd2150ce13f5f5403293757ff796c197a8054bcc830d12b' 
  AND token = 'nW/F5pm3PB0nQUlc3YRM2KBZEZD//9PEHZX7N118Yy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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