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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91761c111e25548d1cb19d483d0c35f83e905cac406347506c57f30df9e7451c' 
  AND token = 'kdRMM3Fr6ehSOI0rI6H1IqiA1hC+AOnEN7glF+soC2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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