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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b197ed66d0c99ae8d5898f2144709f5a64e92170f14e4e0b3e14e78cb4cd3a' 
  AND token = 'aSf3BeMFDzkUFcPoHHYxv34b1ZUd3KZt/RlLC33MfkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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