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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c16d95f588bd2f0557e1ef29bac0199e270ca12b7eac8c2af2484c7f892707f' 
  AND token = 'pVFrp4I2FTmRpOfUlQf3ARArCNkuepsTpkm5Q4jpgG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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