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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bbe13e644575e33b01ee87fa35b923085433b3a3836cc82714d60df64f831bd' 
  AND token = '9yh0SV8jNEg/rk/C4JFPHPT4+83CRAVMKXEzvMqRh3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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