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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '017eda26417e5d903091f1e84638ecf22b8032cfa202623de139ca740ce64b84' 
  AND token = 'OpL3saofB9ziU3uwv699vxHZsjW5Pv65jM3bpUOFqIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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