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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24c60dbd0df5566b698e5f62c2445fd9e951443359dbb04b462e0c8612b3fdf0' 
  AND token = 'U3TA4PC5LU8hD0DnqBLGS4MwsFKmXxfCnl9as2R9V2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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