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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd062f35fc4bfcb2a25c08f3ec21ffb2fd11a7d7808db8ac5e57be549142ba5e' 
  AND token = 'D/cT7a7D5RLsYcMJnMl9+Odg5LcebWBi5mY9us4gVRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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