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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d56f956389c37a037806c0edbce4b89f18d849b316ef5f8957d6a5aa482933' 
  AND token = 'L/IlsraGGCiHCf83mNqIh7stxGGFw2ux+6l08AjqaLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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