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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ede7dc400524edf578edc59d0a22a39d436fc0f83c1a3ba39b165b4e325513d' 
  AND token = '/tLcWubkLEDUdO76laiJVpAhrRDpjp6kB2aNrabrMJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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