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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f1c3982d1fd9b3aa5f1e723caed79504c00f336130af260c9c7f0fbebbddc61' 
  AND token = 'bEltgh8rZ4wF2acn8wWhBGrxoC1R1yecTpbiyF7e/SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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