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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b3fcb4696305f998573eb6df987bdbc736e761d07b52148fe499d8f7207cc5b' 
  AND token = 'SCt+l68nASOUxcrSEED8rm7KbArfTWxSPPDaJCVZm50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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