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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f20168d9b04eb57013c6ecd8b94ea25d69c4a331fc4a15912c7b697be50a3a' 
  AND token = 'y+sdzRukPlJH/4am4hQytYwyCBNb5xAlu4nM6jthzJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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