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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5f72db441d1f4271c1fecadd181f85fbe45b6f7850fe8a958f0147dcfb9ad04' 
  AND token = 'z++/EwteijDMxQul0bsCOlm8+faaA76xDGZAT69f9Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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