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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72d8fe73c6fa118a2f18cfc6357df91ef9a4c7d18adf32c3aaa0c8d2a2cfb405' 
  AND token = 'LKzddGk8M40QfTtRIchV19BKZzTFNPdh6aMpBuQ4N28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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