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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eede53eb67ff06aa33e7f54c74006b6c5845ac2db7b692aa028076c864a94d87' 
  AND token = 'llUPP3yFOVgQFzTf+UFnjGHRu+hGOfr2b+OT/e+sCP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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