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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf1e35811d7f54eadbb61fea12f9c171fe421f50e3b66eb00316306554a89560' 
  AND token = 'x3FPQTq42Vtiw/J4dKvhLxOPdhzhaaGatRepK7eFInc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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