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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a68d2a3da4012d4b56ec9e7b6554f9926481ee15b045b12b3c5ddcb83d150c' 
  AND token = 'pGnmwNLDlNdHDzFpADu269Gj0X0JXjM+YPxf7XS+HIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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