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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f766cf1beb79c8fe77f80e0c013675616767b4d5d9335076f3732be74ad30129' 
  AND token = 'bslr3wjPZS+STz5DNO47TMX1BgbtWqnF1Nt3fFe84Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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