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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '474847e0ba96b6975b3bd6d359b65228e8d43d58072d3511bcc676708ee14966' 
  AND token = 'Ag/aDdxzXb4fnA3Xj0G27OlvP+MvxfZ3W+n/dmVfad0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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