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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2df2aa6a3513a8827c4219b2609487f1109c258cfe3235d7841705d53f7c903e' 
  AND token = 'gIqREMPCrohIvLdiP8OWii4h/eesKghJhLhdaZIx4AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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