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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb79670d1d9dd125c0ec2d001d51cfa0f20ff8afd8b229d0bb993dfa0ea2217' 
  AND token = '8GjCucj2mDUK//Pwr1VmLWXsJ6uRO0cpNHOzMylDJvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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