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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36c88dfb345a3aace4061eead3172c019e17c73a4054e61a618c08ed87734e8a' 
  AND token = '4b0cnR6ydvxx6OFCdtNMSfDrjr/X9jezrn3lE5t3H1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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