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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b551e0e0f35abd1d608ca130367ef44eeea961c862b6031a82bf4c8793c2996' 
  AND token = '3el1rTB4liTIwhbBltJuXcc+y76N0vWxEnXotKB20+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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