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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0b24e58b20bb773ef14e596ebf2f5ec47302d6394b62fe102d34036b1d39eda' 
  AND token = 'fie4eqXFbh1c9mfY8/e+vASowa3u8gs2Lqk9pCdZo2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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