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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0cc0c013042a11e62a5589594d9b651a15360c394fefaec7ecda3cab5f66fed' 
  AND token = 'fcLJKCIA2f2SgpT7GTnh8tCcjs1Bz9ysJu4scz1Aw58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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