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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b9e7a2bcfadbf809dd4d390008f1f9e2900dd5a3c01bc590093a6ce993f196c' 
  AND token = 'sKxrq9HFp2WMsFP2z6uQl7J7+gbzqK+Z2fix9mxZDmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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