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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b220218d2a1a71eb4d4b6a92817f0973c0cc5a69473d4bbe13e47131c2cdaed2' 
  AND token = 'TffiCkfT5bJFVdPqmQWtatzutlvl6nhjOw/3btesVOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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