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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa6a831eabb48bc2dc8edd915e07dd44248b20477448080d756e917bdb91fa09' 
  AND token = 'dB6FZGZzryEeVgWLd1mqNut/iCZYZ6cxt5QfXjPIO9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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