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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b93958c098910abce8a0ceb8a39f3a4f2d631b856c1dac2595e4103cd651a32' 
  AND token = 'QowtOUvQL0CGWoxokq7GZGEQtvVsSOW2dlg8+2oE5cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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