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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ea6c5c6272f85c20003bf6d062bbfa1e5d5154bc3d87ec584e2d788afaa52d' 
  AND token = 'BZDh8NcrPJdIFkrJsrvioae7OJ/Xv0OZFjLdyPqVt0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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