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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae4093fa6f758a2c0620b326835cc4c4cfe380703439aeb81b6e3cec8119628' 
  AND token = 'rJzwb0qsxKMxWFKLkorN9/9b8Ftxh8UDZFegV7Xf2Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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