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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3085bd070edd51d95a64b9f9920f46a25446491617fb354a671bae46b4537829' 
  AND token = 'BZu8SL6tjfIqVgYT2AobwS7kFw07eY4MhCwLu9Hp8I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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