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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620459d02d6805d7fff414b2b72310f5bd13165bd9bfb46efc491532d4268643' 
  AND token = 'dQg94q3LoAxg3RFx6M0RhicETzdyevjxOI45kfGfP1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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