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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2660b4ec9e70dfbe8880e11eda663de669e0f1cd9c92bd01db89484b57421650' 
  AND token = '0ZvdOQGIzgNPdddz3LEjfBkZ7P1urT/iGiyz8HYmt1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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