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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa0c796b0de9d12cd59527c2887a2bd5741b495abfa37029b23dd7f7c2865da6' 
  AND token = 'UXTJDphDtew5jDoX3WcpKLSM0LqncvkeNGJRgaztxsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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