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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77a5e1fcf89a43e616cd3637b95b0d94f6969d82137efe3a40e6fa22220c239' 
  AND token = '0c441Qvl3kqj2EjVECCxC7KUc0z8A1NASmyoj1jfqeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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