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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be3c69d70b1d6f98aa4784b8b0bef9c72fd20d3d8049edb0e6d20a2fa73b40ac' 
  AND token = 'H3nCAiEXtqmbQFVaeR/X8kQVlY/FwJw/VXPJQ0B+kY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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