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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f15042e8b47389c5d02390cdb829e4863b2e420424fdc873f6f565d397ca5af' 
  AND token = 'T4EeFAt1kq43onDXbQ5cmHLBGgspZNJaho88uPqWmXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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