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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b568c7ba5eadb6616068238995d6b0df40cbaad96c6ba2bb3a8d791b9fa6278c' 
  AND token = 'nJqFxDj5Qv0+bwPV2ldHj36iyM5qDcVVEf4P+16nTog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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