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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d8d0c126a7605f276981557fe6b1d18b0f4866bfdd13e7f6008f06292bbe6c' 
  AND token = 'C6PL2Aqw7V40LYi37vWt5/0o+Ql3EvLcRK+N2Hm/l8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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