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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '319ff90ed3e4147d3db149c7bae7861186763a7cedb9c9c578dd800f38e531cf' 
  AND token = 'DP4aAz0zxsNUhmm8RAVvSqYlvGQdpPjSYTIseeCAZJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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