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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba4f34b0387557894b2307517500445db656da224c4fe91c1768e2b05d0f9ff' 
  AND token = 'ale8BAD4QaDrGdbQj657m8rpvgeAlmnp2Uvu+UFXia0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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