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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dfc801117d7f5ca49eed9883531db4c4ca0b99852098d546062aab2dfd1ae8e' 
  AND token = 'vxpMpSCrfe/edKpeujj4cu97IjFFl63Q+kEcpZPJmwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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